package com.atguigu.gulimall.auth.controller;

import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.constant.AuthServerConstant;
import com.atguigu.common.exception.BizCodeEnume;
import com.atguigu.common.utils.R;
import com.atguigu.common.vo.MemberRespVo;
import com.atguigu.gulimall.auth.feign.MemberFeignService;
import com.atguigu.gulimall.auth.feign.ThirdPartFeignService;
import com.atguigu.gulimall.auth.vo.UserLoginVo;
import com.atguigu.gulimall.auth.vo.UserRegisterVo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.util.StringUtils;
import org.springframework.validation.BindingResult;
import org.springframework.validation.FieldError;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.mvc.support.RedirectAttributes;

import javax.servlet.http.HttpSession;
import javax.validation.Valid;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;

@Controller
public class LoginController {

    @Autowired
    private ThirdPartFeignService thirdPartFeignService;

    @Autowired
    private StringRedisTemplate redisTemplate;

    @Autowired
    private MemberFeignService memberFeignService;

    /**
     * SMS发送验证码
     * @param phone
     * @return
     */
    @ResponseBody
    @GetMapping("/sms/sendcode")
    public R sendCode(@RequestParam("phone") String phone){

        //TODO 1.接口防刷
        String redisCode = redisTemplate.opsForValue().get(AuthServerConstant.SMS_CODE_CACHE_PREFIX + phone);
        if (!StringUtils.isEmpty(redisCode)){
            long l = Long.parseLong(redisCode.split("_")[1]);
            if (System.currentTimeMillis() - l <60000){
                //60s内不能再发
                return R.error(BizCodeEnume.SMS_CODE_EXCEPTION.getCode(),BizCodeEnume.SMS_CODE_EXCEPTION.getMsg());
            }
        }

        //2.验证码的再次校验，redis:key-phone, value-code        sms:code:15993060109 -> 1234
        int intCode = (int) (((Math.random() * 9 + 1) * 1000));
        String code =String.valueOf(intCode);

        String subString = code +"_" + System.currentTimeMillis();
        redisTemplate.opsForValue().set(AuthServerConstant.SMS_CODE_CACHE_PREFIX+phone,subString,10, TimeUnit.MINUTES);

        thirdPartFeignService.sendCode(phone,code);
        return R.ok();
    }

    /**
     * TODO 重定向携带数据，利用session原理。将数据放在session中
     *      只要跳到下一个页面取出这个数据以后，session里面的数据就会被删除
     * TODO 1.分布式下session问题
     * 用户注册
     * @param vo
     * @param result
     * @param redirectAttributes
     * @return
     */
    @PostMapping("/regist")
    public String regist(@Valid UserRegisterVo vo, BindingResult result, RedirectAttributes redirectAttributes){
        if (result.hasErrors()){
            Map<String, String> errors = result.getFieldErrors().stream().collect(Collectors.toMap(FieldError::getField,FieldError::getDefaultMessage));
            //RedirectAttributes redirectAttributes重定向携带数据
            redirectAttributes.addAttribute("errors",errors);
            /**
             *  return "/reg.html"; Request method 'post' not supported
             * 用户注册 -> /reg.html(post) -> 转发/reg.html(路径映射默认使用get)：
             */
            //校验出错转发到注册页
            return "redirect:http://auth.gulimall.com/reg.html";
        }
        //1.校验验证码
        String code = vo.getCode();
        String s = redisTemplate.opsForValue().get(AuthServerConstant.SMS_CODE_CACHE_PREFIX + vo.getPhone());
        if (!StringUtils.isEmpty(s)){
            if (code.equals(s.split("_")[0])){
                //删除验证码  <令牌机制>
                redisTemplate.delete(AuthServerConstant.SMS_CODE_CACHE_PREFIX + vo.getPhone());
                //验证码通过 ->  真正注册，调用远程服务
                R r = memberFeignService.regist(vo);
                if (r.getCode()==0){
                    //注册成功跳回登录页
                    return "redirect:http://auth.gulimall.com/login.html";
                }else {
                    Map<String, String> errors = new HashMap<>();
                    errors.put("msg",r.getData("msg",new TypeReference<String>(){}));
                    redirectAttributes.addFlashAttribute("errors",errors);
                    return "redirect:http://auth.gulimall.com/reg.html";
                }
            }else {
                Map<String, String> errors = new HashMap<>();
                errors.put("code","验证码错误");
                redirectAttributes.addAttribute("errors",errors);
                //校验出错转发到注册页
                return "redirect:http://auth.gulimall.com/reg.html";
            }
        }else {
            Map<String, String> errors = new HashMap<>();
            errors.put("code","验证码错误");
            redirectAttributes.addAttribute("errors",errors);
            //校验出错转发到注册页
            return "redirect:http://auth.gulimall.com/reg.html";
        }
    }

    @GetMapping("/login.html")
    public String loginPage(HttpSession session){
        Object attribute = session.getAttribute(AuthServerConstant.LOGIN_USER);
        if (attribute==null){
            return "login";
        }else {
            return "redirect:http://gulimall.com";
        }

    }

    /**
     * 用户登陆
     */
    @PostMapping("/login")
    public String login(UserLoginVo vo, RedirectAttributes redirectAttributes, HttpSession session){
        //远程登陆
        R r = memberFeignService.login(vo);
        if (r.getCode()==0){
            MemberRespVo data = r.getData("data", new TypeReference<MemberRespVo>() {});
            session.setAttribute(AuthServerConstant.LOGIN_USER,data);
            return "redirect:http://gulimall.com";
        }else {
            Map<String,String> errors = new HashMap<>();
            errors.put("msg",r.getData(new TypeReference<String>(){}));
            redirectAttributes.addFlashAttribute("errors",errors);
            return "redirect:http://auth.gulimall.com/login.html";
        }
    }
}
